Rubueno opened a new issue, #6621:
URL: https://github.com/apache/cloudstack/issues/6621
##### ISSUE TYPE
* Improvement Request
##### COMPONENT NAME
~~~
LibvirtComputingResource
~~~
##### CLOUDSTACK VERSION
~~~
>= 4.15
~~~
I think this issue present in any version, although I've not looked further
than 4.15.
##### CONFIGURATION
N/A
##### OS / ENVIRONMENT
N/A
##### SUMMARY
Host memory stats are not updated frequently, leading to (possible)
overcommit issues when live migrating VMs to a host. A manual restart of
cloudstack-agent does update the stats, although this is not a good solution.
##### STEPS TO REPRODUCE
~~~
- Use any KVM hypervisor
- In my case in agent.properties: host.reserved.mem.mb=65536
- Migrate VMs to it until you reach capacity
- It is possible to exceed the host reserved memory
~~~
##### EXPECTED RESULTS
~~~
There should always be RAM available of at least what is specified in
agent.properties: host.reserved.mem.mb
~~~
##### ACTUAL RESULTS
~~~
CloudStack will commit 100% of the host's available RAM to instances
~~~
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